Datasheet > 20IMX7

20IMX7

更新时间： 2022-02-26 11:13:22

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IMX7/IMS7 DC-DC Series Data Sheet 7-Watt DC-DC Converters

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20IMX7 数据手册

IMX7/IMS7 DC-DC Series Data Sheet

7-Watt DC-DC Converters

Note: Suppressor diode D is only necessary for 20IMX7 models.

To withstand 150 V transients according to 19 Pfl 1, applicable for

40 IMX7 models, the same external circuitry with similar

components as for IEC/EN 61000-4-5, level 2 compliance can be

used.

Input Transient Voltage Protection

In many applications transient voltages on the input of the

converter may occur and are possibly caused by short circuits

between Vi+ and Vi–, where the network inductance may

cause high energy pulses.

Input Fuse and Reverse Polarity Protection

In order to protect the converters, transient suppressors are

fitted to the input; see table below:

The suppressor diode on the input also provides for reverse

polarity protection by conducting current in the reverse

direction, thus protecting the converter. An external fuse is

required to limit this current. We recommend for:

Table 3: Built-in transient voltage suppressor

Model

Breakdown

Voltage

V_{BR nom}

Peak Power

at 1 ms

P _P

Peak Pulse

Current

I_PP

– 20IMX7 and 24IMS7 a fast 2 A (F2A) fuse

– 40IMX7 and 48IMS7 a fast 1 A (F1A) fuse

– 70IMX7 a fast 0.63 A (F.63A) fuse

20IMX7¹

24IMS7 ²

40IMX7²

48IMS7 ²

70IMX7²

110IMX7²

overvoltage lockout at approx. 38 V

– 110IMX7 a fast 0.63 A (F.63A) fuse.

53 V

600 W

1500 W

600 W

7.7 A

Inrush Current

100 V

144 V

167 V

11 A

4.1 A

2.9 A

2.5 A

The inrush current has been kept as low as possible by

choosing a very small input capacitance. A series resistor may

be inserted in the input line to limit this current further.

The built-in overvoltage trigger shuts down the converter at

approx. 38 V protecting the input up to 50 V. For higher transient

voltages an external suppressor or voltage limiting circuit as, e.g.,

for IEC/EN 61000-4-5, level 2 compliance should be provided.

04030a

If transients generating currents above the peak pulse current are

possible, an external limiting network such as the circuit

recommended for IEC/EN 61000-4-5, level 2 compliance, is

necessary.

To achieve IEC/EN 61000-4-5, level

2 compliance, an

additional inductor and capacitor should be provided externally

as shown in the figure below. The components should have

similar characteristics as listed in table 4.

80 µs

Fig. 5

Typical inrush current at V_{i nom}, P_{o nom}measured according to

ETS 300132-2 (40IMX7).

07064

Vi+

Vi–

Fig. 4

Example for external circuitry to comply with IEC/EN

61000-4-5, level 2 (transzorb D only for 20IMX7).

Table 4: Components for external circuitry to comply with

IEC/EN 61000-4-5

Model

20IMX7

24IMS7

40IMX7

48IMS7

70IMX7

110IMX7

330 μH, 1 A, 0.115 Ω

330 μH, 0.6 A, 0.42 Ω

1000 μH, 0.6 A, 0.42 Ω

330 μH, 0.2 A

68 μF, 63 V 1.5KE39A

68 μF, 63 V

68 μF, 100 V

200 μF, 200 V

n.a.

BCD20007-G Rev AD, 4-Nov-09

Page 6 of 15

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